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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6ba4e4d11b5234b746530dd8db11be043a23af333975f464651da45fcfa997' 
  AND token = 'SyTIhb85J4nijnNaSbOm6keskPGFkF+PRxYz9vj5wuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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