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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '454aec2fd5681651090d80d0eb633ec03badbc4cc9825fb6cce1cb8e847526fe' 
  AND token = 'I/uYGHHxcqNw6694mg1Ke0Z3OawzWig8a5scOVIyyzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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