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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e09f15b7bd2e827b577c55afae6e40297162f49dc359dfc62a25b718d4015c' 
  AND token = 'XNZ5qM/hWQuapE86mNw0nm7vpPPVp2jyOwbANhZEV5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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