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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de461cfacf206f193416d83a95cfc96101d0d1870af6fe109588ecc5b1ae8b7' 
  AND token = 'SVVb9YrGDQKfRJAdz6luWBr6T7dv0CduashAlUQHZ+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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