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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513c46979a36529c7987325fe9b860e719ee31fcfe3adfef2e511b9520271a4c' 
  AND token = 'BjkYefahHNPEpePQgKELvjz5S4PU7Q8wviLR4sEdqi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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