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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70f0371777f8bd825701e720b76e8cac2ad879b99bb4a2b3a09ee7012a52dca' 
  AND token = '42M40HgHiT/4mwGqCgtii5OQvFwjNq8yGarMAOp2vro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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