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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c868502c8be05dd5b5b4877912309b890837b27e5858980f53894eb393db4029' 
  AND token = 'Ai0DM56ALIspfR1ICFwSZ9MfdBfDN+82mvJLVUEBxag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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