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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b412b8a09603feb0ec285dc672fb637ee08241c2bb000cbe54f89b50958fb60' 
  AND token = 'Tqfdw68MuUQ3Gml8C0qjf0Pk2wGH7ROjnZpwEhA8x/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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