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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a9c16c818af05d1c22aa5956e015bc30a2d29c5f2b2ead6bf16f6dc3f6fe62' 
  AND token = 'gvGdrWYVz23WTVyT8+fAtSI1tyV63Qu3abJ+/679Hg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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