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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b179111cb886751b438f7a6f9f9b4cbbcd20ee4c0746836c47b297d2405a717' 
  AND token = 'aU3gC4XJyMXVPRQg5XHDVkD6fydAwZueXu6dEyRgbIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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