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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b85a37795f38115d8a2e2e01065c3b5c3411a84c1bf652449834a8a5d83d4689' 
  AND token = 'cCMH9nI0aJ2ERtKXhN0Kr5v+UfU7G+mO8w7/wXeq/c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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