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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10843e0e1c39b6df743bcf7e8340bbc1a362ef9bed20d8b0e56e5a4af9e1bb61' 
  AND token = 'q07iT46mOz1Axlp94BuMjbuwXVO7LI/zdnJC7McD104=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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