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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67102489ad7fabcf9e86979faafcb7886bd0a46d7dae472758dbd3806d88e4a7' 
  AND token = 'obI4/Nyw4v0JPdMHV3FN8jNqJzZieT88dsbtOlnEZWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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