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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4330e0c9bc345fe073b6cc36179c0ad4a92e4e97180ea9d41ecc5d5980d6d7ad' 
  AND token = 'BERyxa27uO/i3+4iRiGqtlRl+wNx02JunDE+I+hgoV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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