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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc5c52c1bffffd5a7b1165e642eca55614354575959bff7f65a599faba88969' 
  AND token = '1r3/np6YlTjvVejVnxZRLH/Vb0Ke6IgJxYLS/vLuElU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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