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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4fb85d6dfa42a6a5385d39a839eb9fed6a6835be4897bf54e52ad46591861f' 
  AND token = 'r82oLMMrFWrE4Ti5HRX/q7fFoiDP9nV7PcdsGM7z1Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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