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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7b6d59951fe1e3b1a438daec848da8c1c4e4604f8882b9a1a3177057baefda' 
  AND token = 'jnvYBi9aXF+LtEJdT2mZP4/RxRY54BqgMquMiMtbt5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}