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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97881816dfaa644613eed5ca5c03efe6fe49274eaace90e22d8521b60c22b32' 
  AND token = '4BtXMNoQ2cowelk7JhH1ns//uwRz1RyP9zeLD8lv1Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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