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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d0500468463f8b3b65acd3bcd4ba64906c6614b0675dd4d41c8ccb2fac69339' 
  AND token = '+7gPxBOWzOsJdNcYSejO0J/1LMlacFSGFOZyYRv8g3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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