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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e423c2d539f9a7d23c491c98a95b6cf9a14e805a6ab595882702e192e9ffbb47' 
  AND token = 'MwL4I8VTtl8yEajB8dk3I0AthStDDyt2KtTfdaCplB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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