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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24cbd923a7eb8b57499ded16b5cde6e816b2ec6cb75f35e181dcbab3bfd1ee1a' 
  AND token = 'vgmnO03EEOBsXh1iQyKP0nt6eUP9CZFmSf/f1My63qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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