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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec6a8ab5c7079098cf0c51eabef92d654715b1b79eab1d60cb69db487b8596e' 
  AND token = 'rGcRfMdTK+DRIG6hdZ2+5388btDJqrRXCwBDRVP7JME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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