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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52dda52f376243bac50dc504b45d23a89c259bc575e75b80dd25927fe9b6d852' 
  AND token = 'l3VDIgHwft54R5xNzsx2HXL5SCg4WUw6sM001a38gfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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