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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20116d2e54dbd7bddbd8afcbdd881699eacb86f37dca3c20ed611f72a7e0be9' 
  AND token = 'pHEQATluONEU1k01dXlOVXGx74/iVqaU59pyHWeO+qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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