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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff45761e4e0223df355ddd4e93e7617f0b70c9784bad3261b327d982e852301f' 
  AND token = 'I0CGd73Kkg+h+1V0M8on5urMjlNO2Fx8T54CXKXLMTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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