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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c158bd3d31ab20803780204d34826c58d51ee17c32c5caf5f0fbaff6c7b03d' 
  AND token = '6hsVLeLSib340FRt/Y03EF90VhM6WLA5LTaD+SKKu5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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