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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3008bc0420c1ef9461b929c6e60d94d9e82f77d5c1a45bc860155e1a9ec6e86' 
  AND token = 'I9i1qM4mCZqzGj96PhWpGxDWghS2m2tGfsCEleV5Anw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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