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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3daf820c85d4efa6e02c55b358a254d8dd60d00a3b3021b45bd3135d92fd79f' 
  AND token = '7hE76vhbznX7HdLArTN8Phu3uJ+DrsF4hPq1tBkBhck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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