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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9987818738b34d6c185aa04825a5f8f2546abc2f8896234b2920d4ea8796ab7' 
  AND token = 'uhyTg/b8Rpt3MtW/pbq6memppeqZpIdtC9785VIx5UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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