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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06380994edb920d420aba6bf2401b18f98694774228fbb040f6f59eb3b4f54a5' 
  AND token = 'g0riZuRKzCU5oMUFTWD6ibjfeULd+zbu5Ufq1wZ2Znk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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