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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13622b41be2048ed9bc577671311d9437968e25934411c1a14d9f1871644e62a' 
  AND token = '+GoneEMHqecOlw68A2MDDYJ4zsxEOHxKpkx8QvfsXuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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