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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738cb81e8d346e40b4d7f5c492f20b75d836e1cf32e550f7069b37843913032d' 
  AND token = 'dF+9J/akECODLv1Wbt/Z3qtg+cJ9U8bc+I91f0l8m1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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