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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7cac8cecff8a48b0ec45d11190ac46bf584f8285f0f907d66c113252184a8f' 
  AND token = '8cVqHIlKY76/YbUs9shSA9V9oDTfcr708OClelEnYjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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