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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0acd938c9ae2c41097cd21f76822036790dca4abf68be03bba9f7a4242760dc' 
  AND token = '1Cro3pyj6LHC2put17cwDfmq5Q+YforC2IAPVpSx3OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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