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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c259474af7a0852d7e8541d55d5e786c0842a5a0d0a815fd186563b9696e4124' 
  AND token = 'icNvLWFFIIZiKN7haUfplpS6ApzQre2O6a1z/4ANEu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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