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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5238e9d359e66095e78820cee0cafd085a4681ccba505819fd6c4509c1f7ae' 
  AND token = 'tM2pL7Rr9Vi2JgHxEOgOOD6scQHN6mPKH5X/9A+33IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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