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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dfa66962a5a223c5165cf9bf293caba59d660c1f3b1308bc1936f6a30253556' 
  AND token = 'Ey0QVejNBElsZsqkM7X4gBSq+A2/fPR6nORAdUydf1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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