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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f38b9b55fd85ab83206933901b24866cc449e44f259be89d4857c2e753bc2d15' 
  AND token = '9YbSw+hNoMa2NWw1ZYcANRsdMx6SFumLk5+f0LElFwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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