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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '988730ac0c5b9ef458b5f86be186ded57dc93cf7e55ad6af53f5865dfb3b6cb6' 
  AND token = 'M6HVaOFR3lo9gsY85uw85KrT/e54Lf6LDg2nwyrOIxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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