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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13f51de2f0043dfc10d4c99d60912a3172bcb834ef4ccfc588f5ac0976ffe20' 
  AND token = 'kGWB0Uq07EYGUIicx0Gc/KG/rk43wakW7kgFw8YyPDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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