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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c9d2ab8d14e7a432107e5252376d87b50b22cc2f07b27d753d4822ce526b0b' 
  AND token = 'I1ZKls+EFBie2svdK0y2U5vP2TDif7SDhUlAzmgYUqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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