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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a20d19d0563e7906c6807cb4609ab79a8dcac674e0a027aad584d75d47c6b2' 
  AND token = 'PuDeVvDb3rzC82hI8tW7XdGu7caMBQ4hxQ0EojlgCzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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