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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a740fcfa655a1c3eacec2bbc8c8f4fa44b9fb7ceafa12fcafc8ca67b580afaf2' 
  AND token = '5KYovWhjg5AYPFif+auHnBcgvgrEje6mYDXwYaRuiV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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