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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce75c807e11dd46a0b2cf4de5460985371e230502ad8608a7b87779299530f69' 
  AND token = 'UodH5xng7RrZvUUFtWwh9V0Dwdkl+NGA/mRRMQzNedY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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