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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '904be35e62d191f25306a0c189e949f3c83b411ee3dac7045bede192b71f830a' 
  AND token = 'lvjxZbfpPquKB+R74/csa/Pl9xEIc9cSeE23GBMVbOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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