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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb2d6f96cf3404d2f144337a706f1bf870bf4842f42b80f25a9b61f0bd0c64f' 
  AND token = '73plZjU4CqVyC2oJXryhuLvQf+JRkqxVe/ScNqgE/4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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