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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4953244c7903de3a08d4683cb511ed1dcc96a9c2fcc24de93e10051d8f5d8b' 
  AND token = '885oNHys1BknYVIn0trfxBF/sEHyiaq/iDbP/gL3lW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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