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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e73af87789d169563df287ae52be9cfb4cf06c87184e89b4a93d24a56d8a13' 
  AND token = 'sRQduKeqMlG4kiWvUIueOOOqu9Q76JrDh8ksRmYhrZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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