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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b2c3311079284bdcc448d73372ecc465e2f7dcf1040a3932fcca09e10fc2f4e' 
  AND token = 'WBJRklo9uTQjQrFVYN8Ctu3FSl3gtqJHJkot8tt33hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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