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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b6c1b4fbb1274884024560919dcf23081cb86fa43a610eb5a26b608b4718692' 
  AND token = 'ahS9In6asnrES9QnioDyw49qA0t1ZXtTmchZjfxyLTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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