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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e206b33645fc2a76e7794ab59bb168b43a2e262af058ae41b32544e60450059' 
  AND token = 'DuyivCbYLPjFwVy6jURbZ5CuLLnCP8oaEHV3sMnjo9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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