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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c95db5e8cf82bfcf06f7be11baff94cfc028e1953b3080138995152eb8b9c4' 
  AND token = 'RF0SLSmCpL2PYfMCpzl4RhcQdV/XaHW/Q2kmE/NU9g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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