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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adea32241cd294c445dee17b1c33fdea461b5ed7e79588ad6c33d7e5a8bdb90a' 
  AND token = '6MO+k8lmm8dpUKq5BM+pZxAWzL0aOIbUpOsF54hbK0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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