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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c89513d7fbcff47a709fff23de9dd0019c6904c38cba958dc2f0015716accc1' 
  AND token = 'im+9ksTp0M4WWYosf+vT0jwyWVAeY/8ubirJ029AKIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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