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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2f8bf4dc9ee8681547d5c6bd7cf0e03f81425e0e82af54e438d822a0ba7cc16' 
  AND token = '7eUfBRLtjkNf9EknrG/Ns8yrns5C5/ud+NKc+Mry8NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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