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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '656f84325be4c78f824c9a557d3c11d7b6987899184242507a7b42eb738213e2' 
  AND token = 'z1VX6q1+frwrotny5IAdsael8p0EjD2mAyTftutdkD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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