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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b2ac8687d80fa23e4c6629a83b349d80bd8561f476b07b54c0960562d57cdc' 
  AND token = 'hkoaGSgNjizPUskz2gIcR3h08dV+uyhmmUa/hM1X0AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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