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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e893998e9b22a6d3c688f343f5cb2e2530c21d2b39972ecb3ff08a7fa7c2ba7' 
  AND token = 'v3/lwRlY8a5bz2ubbbAZ+dDkjmTiHvCqwoxWAbv7hrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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