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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2c914324a7765bb6fbd3c2d499943fb88f3a2f3473fc8100c0b9f5d156c47c' 
  AND token = 'aA7d1jJrTSElj8xAnJsF1N1CiyTuDy/dpjBB9JzAimY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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