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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275483c4b72fae1892a106e145e71f3eee395206b23d0b32463ade245c975de2' 
  AND token = '+9Y3yx0UH5EWN3JMFQLevezJjY91b8XY1GI5SZU1x8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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